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Diodes Incorporated AP7381-50SA-7
- Part No.:
- AP7381-50SA-7
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP7381-50SA-7.pdf
- Description:
- IC REG LIN 5V 150MA SOT23 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:3,952
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Product details
Overview
AP7381-50SA-7 from Diodes Incorporated is a fixed-output 5.0V ultra-low dropout (ULDO) linear regulator IC designed for space-constrained, battery-powered systems. It delivers up to 150mA output current with 1000mV dropout at 100mA, ±2% output voltage accuracy over load/temperature, and only 2.5µA ground current at zero load - enabling long runtime in portable USB devices and smart meters.
For engineers reviewing the AP7381-50SA-7 datasheet, AP7381-50SA-7 pinout, AP7381-50SA-7 application, or AP7381-50SA-7 equivalent, key selection criteria include wide 3.3–40V input range, thermal shutdown and short-circuit protection, compatibility with low-ESR ceramic capacitors, and SOT23-3 package suitability for high-density PCB layouts.
Technical Context
The AP7381-50SA-7 integrates a precision voltage reference, error amplifier, resistor network for fixed 5.0V output, current-limit circuitry, and chip-enable logic. Its architecture supports stable regulation across -40°C to +125°C junction temperature with no external compensation required.
It features active thermal shutdown at +160°C with +20°C hysteresis, 60dB PSRR at 1kHz, and excellent line regulation (0.05%/V) and load regulation (0.5%) - making it suitable for noise-sensitive analog rails and dynamically varying loads in embedded instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% - ensures stable MCU core or sensor bias rail without external feedback. |
| Input Voltage Range | 3.3V to 40V - supports direct connection to unregulated 12V/24V industrial buses or multi-cell battery stacks. |
| Max Output Current | 150mA - sufficient for powering microcontrollers, RF modules, and small LCD backlights. |
| Dropout Voltage | 1000mV @ 100mA - enables operation down to VIN = 6.0V while maintaining regulated 5.0V output. |
| Ground Current | 2.5µA @ IOUT = 0mA - minimizes quiescent power loss in always-on metering or IoT sleep modes. |
| PSRR | 60dB @ 1kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Thermal Shutdown | +160°C with +20°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
Pinout & Package
SOT23-3 package: compact 2.9mm × 1.3mm footprint with 0.95mm lead pitch; thermally enhanced for 167°C/W junction-to-ambient; RoHS-compliant matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Supply | Accepts 3.3–40V unregulated input; requires 1µF ceramic decoupling close to pin. |
| 2 (VOUT) | Regulated Output | Delivers stable 5.0V ±2%; requires 2.2µF low-ESR ceramic capacitor for stability. |
| 3 (GND) | Power Ground | Common return path for input/output currents; must be low-impedance connection to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 2.5µA at zero load - extends battery life in always-on utility meters and remote sensors. |
| Wide input voltage support | 3.3V to 40V - eliminates need for pre-regulation stages in automotive or industrial 12/24V systems. |
| Ceramic capacitor compatible | No ESR requirement - allows use of small, reliable 0402/0603 MLCCs instead of bulkier tantalum or aluminum electrolytics. |
| Integrated protection | Current limit (150mA), thermal shutdown (+160°C), and short-circuit protection - reduces external component count and board area. |
| High accuracy output | ±2% over -40°C to +125°C - ensures reliable operation of ADC references and precision analog circuits without calibration. |
Applications
| Smart Electricity Meters | USB-Powered Portable Instruments |
|---|---|
|
Use Scenario: Powering metrology ICs, real-time clocks, and RF transceivers in Class 0.2 electricity meters operating from 3-phase AC rectified bus. IC Role / Device Role / Timing Role: Primary 5.0V supply regulator for measurement subsystem; provides clean, low-noise rail independent of input ripple. Use Value: 60dB PSRR and ±2% accuracy maintain ADC linearity and timekeeping stability under fluctuating mains conditions. |
Use Scenario: Regulating power for handheld multimeters, thermal imagers, and portable oscilloscopes powered by single-cell Li-ion or USB-C PD sources. IC Role / Device Role / Timing Role: Post-regulator delivering stable 5.0V to microcontroller, display driver, and analog front-end. Use Value: 2.5µA quiescent current and 1000mV dropout extend battery runtime and enable operation down to 6.0V input from partially discharged packs. |
| Laptop Peripheral Modules | Industrial Sensor Nodes |
|
Use Scenario: Powering USB-C dock accessories (HDMI adapters, Ethernet PHYs) drawing <150mA from variable 5–20V PD input. IC Role / Device Role / Timing Role: Input-stage LDO isolating downstream 5.0V logic from upstream PD negotiation transients. Use Value: Fast load transient response and thermal shutdown protect against hot-plug surges and connector misinsertion events. |
Use Scenario: Supplying isolated 5.0V rail to MEMS pressure sensors and signal-conditioning amplifiers in factory-floor vibration monitors. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 24V industrial bus to noise-immune analog domain supply. Use Value: 0.05%/V line regulation maintains sensor offset stability despite 24V bus fluctuations due to motor switching noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ULDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1703T-5002E/MB | 5.0V output, 250mA rating, 600mV dropout @ 250mA, 3.5µA IQ - higher current but larger SOT89-3 package. | Requires more PCB area; better suited for higher-current peripherals where thermal margin is critical. | Select when >150mA load or lower dropout is mandatory; avoid if SOT23-3 footprint is fixed. |
| NCP1117ST50T3G | 5.0V output, 1A rating, 1200mV dropout @ 800mA, 6mA IQ - significantly higher quiescent current and thermal resistance. | Not suitable for battery longevity; used in mains-powered industrial controllers with ample heatsinking. | Choose only for cost-sensitive, non-battery applications where 1A headroom justifies 2.4× higher IQ and TO-220/SOT223 footprint. |
Compared with MCP1703T-5002E/MB and NCP1117ST50T3G, the AP7381-50SA-7 uniquely balances ultra-low IQ (2.5µA), SOT23-3 size, and 40V input tolerance - making it optimal for space- and energy-constrained portable and metering designs where neither higher current nor higher IQ is acceptable.
Availability
AP7381-50SA-7 is available at Aetrix Electronics and suitable for smart metering, USB-powered test equipment, and industrial sensor nodes requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for AP7381-50SA-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP7381 series belongs to Diodes' precision ULDO regulator product line, engineered specifically for battery-powered and wide-input industrial applications demanding low IQ, high accuracy, and robust protection - not general-purpose LDO use.
FAQ
What is the minimum input voltage required for AP7381-50SA-7 to regulate 5.0V output?
The AP7381-50SA-7 requires VIN ≥ VOUT + VDROP. With a typical dropout of 1000mV at 100mA, the minimum functional input is 6.0V under that load. At lighter loads (e.g., 1mA), dropout drops below 200mV, allowing regulation from as low as 5.2V - confirmed per Electrical Characteristics table on page 3 of DS39917 Rev. 5-2.
Can AP7381-50SA-7 operate with a 10µF ceramic output capacitor?
Yes - the AP7381-50SA-7 is explicitly designed for low-ESR ceramic capacitors, and the datasheet specifies stability with 2.2µF minimum. A 10µF X7R ceramic capacitor improves transient response and reduces output ripple further, with no risk of oscillation due to its internal compensation.
Does AP7381-50SA-7 include an enable pin?
No - the AP7381-50SA-7 has no dedicated enable (EN) pin. It operates continuously when VIN is within specification. For on/off control, external switching of VIN or use of the AP7382 variant (which adds active-high EN) is required - confirmed by Pin Descriptions table on page 2 and absence of EN pin in SOT23 pinout.
Is AP7381-50SA-7 qualified for automotive applications?
No - the AP7381-50SA-7 is not AEC-Q100 qualified. The datasheet explicitly states that automotive-grade versions require separate qualification (PPAP, IATF 16949 manufacturing) and must be requested directly from Diodes; this SOT23-3 variant is intended for industrial and commercial applications only.
AP7381-50SA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- 25 µA
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Current Limit, Short Circuit, Thermal Shutdown
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AP7381-50SA-7 FAQ
1.How can I place an order for AP7381-50SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7381-50SA-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AP7381-50SA-7 reliable?
The price and inventory of AP7381-50SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7381-50SA-7 is usually 5 days.
3.What payment methods are accepted for AP7381-50SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7381-50SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7381-50SA-7?
AP7381-50SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7381-50SA-7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AP7381-50SA-7?
For technical support, including AP7381-50SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7381-50SA-7 requirements.
6.How does Aetrix verify that AP7381-50SA-7 is sourced from the original manufacturer or authorized distributors?
All AP7381-50SA-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AP7381-50SA-7 meets industry standards.
7.What is the process for return or replacement of AP7381-50SA-7?
All AP7381-50SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7381-50SA-7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AP7381-50SA-7 part is unused and in its original packaging.
Return procedure for AP7381-50SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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